Flowcoat / Tiecoat (Clear)

This clear flowcoat is a wax-containing polyester formulation designed to cure tack-free when applied to the non-mold (back) side of a finished FRP laminate, exposed to air. Conventional gelcoats and polyester laminates cure with a permanently tacky surface on the air-exposed side due to oxygen inhibition of free-radical polymerization. This flowcoat contains dissolved paraffin wax that migrates to the surface during cure, forming a barrier layer that excludes oxygen and allows complete surface polymerization. The result is a hard, non-tacky, smooth cosmetic finish on the back of laminates, tanks, and FRP products. The clear formulation allows the laminate color to show through. Applied by brush or roller at 0.3–0.5 mm wet film, the product gels in 20–35 min at 20°C with 1.5% MEKP and achieves Barcol hardness 30–40 after full cure. Can also be used as a tiecoat between two polyester laminate layers, or as a primer coat on a cured laminate surface before secondary bonding.